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POiOS: Accessing the same instance of UIViewController that called the Segue
 

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  1. POiOS: Accessing the same instance of UIViewController that called the Segue
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    <p>I have two view controllers. MainViewController pushes SignUp ViewController. Once SignUp View Controller dismisses, I need access to the same instance of MainViewController to update a UIButton.title. </p> <p>.h MainView</p> <pre><code>//MainViewController.h #import &lt;UIKit/UIKit.h&gt; @interface MainViewController : UITableViewController -(void)loggedIn; @end </code></pre> <p>.m</p> <pre><code>@interface MainViewController () @end -(void)loggedIn { NSLog (@"This is Logged in inside MainView.m"); self.logInOutButton.title = @"Logout"; } - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { UIViewController *destinationViewController = segue.destinationViewController; Signup *signUp = [destinationViewController isKindOfClass:[SignUp class]] ? (Signup*)destinationViewController : nil; signUp.mainViewController = self; NSLog(@"Preapre For Segue %@", self); } </code></pre> <p>.h SignUp</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import "MainViewController.h" @interface SignUp : UIViewController @property (strong, nonatomic) MainViewController *mainViewController; @end </code></pre> <p>.m</p> <pre><code>@synthesize mainViewController; - (void) loggedIn { NSLog(@" MainViewController %@", mainViewController); [mainViewController loggedIn]; self.presentingViewController dismissViewControllerAnimated:YES completion:nil]; } </code></pre> <p>When I do NSLog I'm getting different values:</p> <pre><code>Preapre For Seg &lt;STMainViewController: 0x9f7d600&gt; MainViewController (null) </code></pre>
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    1. USuser1107173
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    1. COHave you tried logging what the signUp View Controller is after you assign the mainViewController? Looks like there might be an intermediary controller between the two, most likely a navigation controller...
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      1. USDavid Doyle
    2. COCheck to see if `signUp` is `nil` before you set the `mainViewController` property.
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      1. POiOS: Accessing the same instance of UIViewController that called the Segue
      1. USMarcus Adams
    3. COSee the discussion of delegate protocols in the "passing data back" section of http://stackoverflow.com/a/9736559/1271826
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      1. POiOS: Accessing the same instance of UIViewController that called the Segue
      1. USRob
 

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